ATP is the main energy-providing molecule in living organisms.
Answer:
4.5 billion years ago
Earth hasn't always been a blue and green oasis of life in an otherwise inhospitable solar system. During our planet's first 50 million years, around 4.5 billion years ago, its surface was a hellscape of magma oceans, bubbling and belching with heat from Earth's interior.
Explanation:
<span>Midbrain also called the mesencephalon</span>
<span>Cardiovascular heath</span>
Hemoglobin is the pigment in red blood cells responsible for carrying oxygen